drivers/net/ethernet/sfc/ef100_rx.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /****************************************************************************
   3  * Driver for Solarflare network controllers and boards
   4  * Copyright 2005-2019 Solarflare Communications Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 as published
   8  * by the Free Software Foundation, incorporated herein by reference.
   9  */
  10
  11 #include "net_driver.h"
  12 #include "ef100_rx.h"
  13 #include "rx_common.h"
  14 #include "efx.h"
  15 #include "nic_common.h"
  16 #include "mcdi_functions.h"
  17 #include "ef100_regs.h"
  18 #include "ef100_nic.h"
  19 #include "io.h"
  20
  21 /* Get the value of a field in the RX prefix */
  22 #define PREFIX_OFFSET_W(_f)     (ESF_GZ_RX_PREFIX_ ## _f ## _LBN / 32)
  23 #define PREFIX_OFFSET_B(_f)     (ESF_GZ_RX_PREFIX_ ## _f ## _LBN % 32)
  24 #define PREFIX_WIDTH_MASK(_f)   ((1UL << ESF_GZ_RX_PREFIX_ ## _f ## _WIDTH) - 1)
  25 #define PREFIX_WORD(_p, _f)     le32_to_cpu((__force __le32)(_p)[PREFIX_OFFSET_W(_f)])
  26 #define PREFIX_FIELD(_p, _f)    ((PREFIX_WORD(_p, _f) >> PREFIX_OFFSET_B(_f)) & \
  27                                  PREFIX_WIDTH_MASK(_f))
  28
  29 #define ESF_GZ_RX_PREFIX_NT_OR_INNER_L3_CLASS_LBN       \
  30                 (ESF_GZ_RX_PREFIX_CLASS_LBN + ESF_GZ_RX_PREFIX_HCLASS_NT_OR_INNER_L3_CLASS_LBN)
  31 #define ESF_GZ_RX_PREFIX_NT_OR_INNER_L3_CLASS_WIDTH     \
  32                 ESF_GZ_RX_PREFIX_HCLASS_NT_OR_INNER_L3_CLASS_WIDTH
  33
  34 bool ef100_rx_buf_hash_valid(const u8 *prefix)
  35 {
  36         return PREFIX_FIELD(prefix, RSS_HASH_VALID);
  37 }
  38
  39 static bool check_fcs(struct efx_channel *channel, u32 *prefix)
  40 {
  41         u16 rxclass;
  42         u8 l2status;
  43
  44         rxclass = le16_to_cpu((__force __le16)PREFIX_FIELD(prefix, CLASS));
  45         l2status = PREFIX_FIELD(&rxclass, HCLASS_L2_STATUS);
  46
  47         if (likely(l2status == ESE_GZ_RH_HCLASS_L2_STATUS_OK))
  48                 /* Everything is ok */
  49                 return 0;
  50
  51         if (l2status == ESE_GZ_RH_HCLASS_L2_STATUS_FCS_ERR)
  52                 channel->n_rx_eth_crc_err++;
  53         return 1;
  54 }
  55
  56 void __ef100_rx_packet(struct efx_channel *channel)
  57 {
  58         struct efx_rx_buffer *rx_buf = efx_rx_buffer(&channel->rx_queue, channel->rx_pkt_index);
  59         struct efx_nic *efx = channel->efx;
  60         u8 *eh = efx_rx_buf_va(rx_buf);
  61         __wsum csum = 0;
  62         u32 *prefix;
  63
  64         prefix = (u32 *)(eh - ESE_GZ_RX_PKT_PREFIX_LEN);
  65
  66         if (check_fcs(channel, prefix) &&
  67             unlikely(!(efx->net_dev->features & NETIF_F_RXALL)))
  68                 goto out;
  69
  70         rx_buf->len = le16_to_cpu((__force __le16)PREFIX_FIELD(prefix, LENGTH));
  71         if (rx_buf->len <= sizeof(struct ethhdr)) {
  72                 if (net_ratelimit())
  73                         netif_err(channel->efx, rx_err, channel->efx->net_dev,
  74                                   "RX packet too small (%d)\n", rx_buf->len);
  75                 ++channel->n_rx_frm_trunc;
  76                 goto out;
  77         }
  78
  79         if (likely(efx->net_dev->features & NETIF_F_RXCSUM)) {
  80                 if (PREFIX_FIELD(prefix, NT_OR_INNER_L3_CLASS) == 1) {
  81                         ++channel->n_rx_ip_hdr_chksum_err;
  82                 } else {
  83                         u16 sum = be16_to_cpu((__force __be16)PREFIX_FIELD(prefix, CSUM_FRAME));
  84
  85                         csum = (__force __wsum) sum;
  86                 }
  87         }
  88
  89         if (channel->type->receive_skb) {
  90                 struct efx_rx_queue *rx_queue =
  91                         efx_channel_get_rx_queue(channel);
  92
  93                 /* no support for special channels yet, so just discard */
  94                 WARN_ON_ONCE(1);
  95                 efx_free_rx_buffers(rx_queue, rx_buf, 1);
  96                 goto out;
  97         }
  98
  99         efx_rx_packet_gro(channel, rx_buf, channel->rx_pkt_n_frags, eh, csum);
 100
 101 out:
 102         channel->rx_pkt_n_frags = 0;
 103 }
 104
 105 static void ef100_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index)
 106 {
 107         struct efx_rx_buffer *rx_buf = efx_rx_buffer(rx_queue, index);
 108         struct efx_channel *channel = efx_rx_queue_channel(rx_queue);
 109         struct efx_nic *efx = rx_queue->efx;
 110
 111         ++rx_queue->rx_packets;
 112
 113         netif_vdbg(efx, rx_status, efx->net_dev,
 114                    "RX queue %d received id %x\n",
 115                    efx_rx_queue_index(rx_queue), index);
 116
 117         efx_sync_rx_buffer(efx, rx_buf, efx->rx_dma_len);
 118
 119         prefetch(efx_rx_buf_va(rx_buf));
 120
 121         rx_buf->page_offset += efx->rx_prefix_size;
 122
 123         efx_recycle_rx_pages(channel, rx_buf, 1);
 124
 125         efx_rx_flush_packet(channel);
 126         channel->rx_pkt_n_frags = 1;
 127         channel->rx_pkt_index = index;
 128 }
 129
 130 void efx_ef100_ev_rx(struct efx_channel *channel, const efx_qword_t *p_event)
 131 {
 132         struct efx_rx_queue *rx_queue = efx_channel_get_rx_queue(channel);
 133         unsigned int n_packets =
 134                 EFX_QWORD_FIELD(*p_event, ESF_GZ_EV_RXPKTS_NUM_PKT);
 135         int i;
 136
 137         WARN_ON_ONCE(!n_packets);
 138         if (n_packets > 1)
 139                 ++channel->n_rx_merge_events;
 140
 141         channel->irq_mod_score += 2 * n_packets;
 142
 143         for (i = 0; i < n_packets; ++i) {
 144                 ef100_rx_packet(rx_queue,
 145                                 rx_queue->removed_count & rx_queue->ptr_mask);
 146                 ++rx_queue->removed_count;
 147         }
 148 }
 149
 150 void ef100_rx_write(struct efx_rx_queue *rx_queue)
 151 {
 152         struct efx_rx_buffer *rx_buf;
 153         unsigned int idx;
 154         efx_qword_t *rxd;
 155         efx_dword_t rxdb;
 156
 157         while (rx_queue->notified_count != rx_queue->added_count) {
 158                 idx = rx_queue->notified_count & rx_queue->ptr_mask;
 159                 rx_buf = efx_rx_buffer(rx_queue, idx);
 160                 rxd = efx_rx_desc(rx_queue, idx);
 161
 162                 EFX_POPULATE_QWORD_1(*rxd, ESF_GZ_RX_BUF_ADDR, rx_buf->dma_addr);
 163
 164                 ++rx_queue->notified_count;
 165         }
 166
 167         wmb();
 168         EFX_POPULATE_DWORD_1(rxdb, ERF_GZ_RX_RING_PIDX,
 169                              rx_queue->added_count & rx_queue->ptr_mask);
 170         efx_writed_page(rx_queue->efx, &rxdb,
 171                         ER_GZ_RX_RING_DOORBELL, efx_rx_queue_index(rx_queue));
 172 }